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The fatigue failure analysis and fatigue life prediction model of FV520B-I as a function of surface roughness in HCF regime

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Abstract

The high-cycle fatigue (HCF) behavior is significantly affected by surface roughness, especially for high strength metal FV520B-I. However, with surface roughness effect, neither the fatigue property, nor the high-cycle fatigue life model about FV520B-I with surface roughness has been reported. In this paper, designed fatigue experiment using the specimen with different surface roughness is presented to study the effectiveness of the roughness to the fatigue. The observations of the fatigue crack initiation sites and the crack propagation. Then the high cycle fatigue behavior of FV520B-I affected by surface roughness is analyzed. The existing very-high-cycle fatigue life model is not well-fit for high-cycle fatigue model of FV520B-I. A NEW high-cycle fatigue life prediction model of FV520B-I, taking surface roughness as a main effective variable is proposed. The model is built up by a comprehensive use of experimental data and the traditional fatigue modeling theory. The new finding between the fatigue strength coefficient and stress amplitude, with surface roughness, is adopted, leading to a NEW modified life prediction model. Study on fatigue model of FV520B-I with surface roughness is a very beneficial effort in fatigue theory and fatigue engineering development.

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ACKNOWLEDGMENT

The authors gratefully acknowledge the financial support from the National Key Base Research and Development Program (No. 2011CB013401) and the National Natural Science Foundations of China (51375074, 51475077).

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Authors and Affiliations

  1. School of Mechanical Engineering, Dalian University of Technology, Dalian, 116023, People’s Republic of China

    Jin-long Wang, Yuan-liang Zhang, Qing-chen Zhao, Min Zhang & Ze-ming Guan

  2. College of Engineering, South Dakota State University, Brookings, SD, 57007-0001, USA

    Hui-tian Lu

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  1. Jin-long Wang
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  2. Yuan-liang Zhang
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  3. Qing-chen Zhao
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  4. Min Zhang
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  5. Ze-ming Guan
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Correspondence to Yuan-liang Zhang.

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Wang, Jl., Zhang, Yl., Zhao, Qc. et al. The fatigue failure analysis and fatigue life prediction model of FV520B-I as a function of surface roughness in HCF regime. Journal of Materials Research 32, 634–643 (2017). https://doi.org/10.1557/jmr.2016.513

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